Finding the Fourth Proportional to 9,997.68, 13,788.48 and 7,485.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,997.68 : 13,788.48 = 7,485.72 : x
2. Step 2: Convert to fraction form
   9,997.68/13,788.48 = 7,485.72/x
3. Step 3: Cross multiply
   9,997.68x = 13,788.48 × 7,485.72
4. Step 4: Simplify right side
   9,997.68x = 103,216,700.51
5. Step 5: Solve for x
   x = 103,216,700.51/9,997.68
6. Step 6: Final answer
   x = 10,324.07